1.1 This test method covers the determination of benzene,toluene,ethylbenzene,the xylenes,C₉ and heavier aromatics, and total aromatics in finished motor gasoline by gas chroma- tography.
1.2 The aromatic hydrocarbons are separated without inter-ferences from other hydrocarbons in finished gasoline.Non-aromatic hydrocarbons having a boiling point greater than-n-dodecane may cause interferences with the determination of the C₉ and heavier aromatics.For the Cg aromatics,p-xylene and m-xylene co-elute while ethylbenzene and o-xylene are separated.The C₉ and heavier aromatics are determined as a single group.
